America’s Best Nut Co. (online)
Peanuts, processed in a peanut-only facility. (This isn’t actually a decidedly nut-free brand, but peanuts produced in a nut-free facility are so incredibly hard to find that I figured I’d list these.)

Better Bites Bakery(Whole Foods)
Top 8–free cookie dough bites. (They have other products, too, but I’m not sure whether those are tree nut–free. Their website’s under construction, so you’d need to get a look at their packaging to be sure.)

Bitsy’s Brainfood(Target, Whole Foods, Fairway)
Vegetable-based cookies and crackers, all made in a nut-free facility. (Bitsy’s Brainfood makes cereals, too, but they’re made in a different facility that isn’t tree nut–free.)

Bo & Ty Sweets (online)
Chocolates and candies, all made in a 100% nut-free environment.

Goetze’s Candy(online, various stores)
Their Caramel Creams and Cow Tales are processed in a nut- and peanut-free facility. (Note: Some of their other products are processed in a different facility that processes peanuts. See this page for details.)

Golden Fluff (online, various kosher markets)
A kosher snack and candy company with nut-, peanut-, gluten-, and soy-free options.

The Good Bean (Stop & Shop, Duane Reade)
Nut-free, gluten-free roasted chickpeas, bean chips, and bars. (The roasted chickpeas and the bean chips are made in a nut-free facility. The bars are made in a facility that uses nuts elsewhere, but they’re kept separate from the nut products and should still be nut-free.)

I.M. Healthy(Gristedes, Stop & Shop, Target, Whole Foods)
Soy butter, cornflake/tortilla crumbs, and granolas, all made in facilities that are free of nuts (and a bunch of other things, too—it’s complicated).

Maplehurst Bakeries (Key Food, Food Emporium, Stop & Shop)
A bakery with a nut-free line that’s available at various grocery stores. (Maplehurst does make some products that aren’t nut-free, but the ones made in a nut-free facility will be marked with a conspicuous peanut-free sign.)

Raaka Chocolate(Whole Foods)
Various artisanal dark chocolate bars, all free from gluten, dairy, soy, and nuts. They also offer tours and classes at their factory in Red Hook. (Their factory is entirely nut-free, but they don’t guarantee that their suppliers’ factories are.)

Stern’s Bakery (online, various kosher markets)
A nut-free kosher bakery based in Brooklyn. (They don’t have a website. Here‘s their Yelp—they apparently have a storefront, but I’ve been unable to find it—and here are some of their products.)

Superior on Main(Whole Foods, Costco, Price Chopper)
Cookies, brownies, and éclairs, all made in a nut-free facility.